1. Better sharing on iOS. I'm thinking in particular of the share cards in BB10 and Android. A central area that developers can hook into and allow you to share media from across your device.
2. Widgets. This is an awkward one. I want a more customisable experience but I don't want the Android widget model which I find gets messy. Maybe an expansion of the search screen and better use of notifications?
3. Cross service integration. This seems unlikely but being able to grant calendars and images access to people with Google logins would be a big winner for me.
4. Dropbox. The expansion of iCloud to include a Dropbox style service again. I miss having somewhere to store files that aren't in Pages, Numbers or Keynote.
5. On the Mac I'd love to see better syncing across multiple computers. For example an iPhoto library on my MacBook could be kept easily in sync with one on my desktop.
6. A new version of iWork.
Lets see what happens in a few hours but these would be some very useful additions to an already formidable arsenal of digital services and features.